Appendix

Calculation accuracy

•The calculator solves an equation by comparing the values of the left- hand and right-hand sides of the equation through 14-digit internal operations. If the value of the left-hand side is sufficiently close to agreeing with that of the right-hand side the calculator may present one of the ‘approximate’ values as a solution — even though it is not the true solution.

•The calculator will also stop trying to solve an ‘approximate’ solution either when it has performed more than 50 iterations using each initial expected value or when it has obtained an ‘approximate’ solution that is the same (to 10-digit accuracy) twice in succession.

Changing the range of expected values

After entering your equation by pressing I 5, press @ J to adjust the range of expected values. The calculator will then prompt you for a range of expected values (between –1 ⋅ 1099 and +1 ⋅ 1099) to be used in the calculation.

RANGE:a<b

 

a=

–1.

b=

1.

a:Lower limit

b:Upper limit

•The range of expected values returns to its default setting (–1 ⋅ 1010 to +1 ⋅ 1010) when the current equation is cleared or the mode is changed.

After entering the lower and upper limits (a and b) of the range of expected values, press j to return to the previous display.

•The best solution can be found by defining the lower or upper limit (a or b) or initial value close to the expected solution.

•Having done this, press @ h several times to generate slightly different solutions. You can judge which of these is the best by comparing the values displayed for the left-hand and right-hand sides of the equation.

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Sharp EL-5250, EL-5230 operation manual Calculation accuracy, Changing the range of expected values
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EL-5230, EL-5250 specifications

The Sharp EL-5250 and EL-5230 are advanced scientific calculators that cater to students, professionals, and anyone in need of a reliable tool for complex calculations. Both models are designed with a blend of functionality, portability, and user-friendliness, making them excellent choices for math and engineering tasks.

The Sharp EL-5250 is equipped with a wide range of features ideal for higher-level calculations. It supports over 500 functions, including trigonometric, exponential, logarithmic, and statistical computations. The calculator also includes built-in memory functions, allowing users to store and recall values effortlessly. The large, easy-to-read LCD display can present multiple lines of data simultaneously, enhancing clarity and reducing the need for repetitive calculations.

On the other hand, the EL-5230, while slightly less advanced, still offers a robust set of functions. This model is particularly well-suited for students in high school or early college, providing essential functionalities for algebra, geometry, and basic statistics. Its 240 functions cover a variety of mathematical disciplines, making it a versatile option for different educational needs.

Both calculators feature Sharp's unique "MathPrint" technology, which is a standout characteristic allowing users to view fractions, square roots, and other expressions in a format more akin to traditional textbook layouts. This technology greatly enhances comprehension and usability, particularly for visual learners.

The calculators are powered by dual power sources, utilizing both solar and battery power, ensuring reliability in diverse environments. The compact and lightweight design of the EL-5250 and EL-5230 makes them highly portable. Users can easily carry them in a backpack or briefcase without added bulk.

Durability is another aspect where Sharp excels. The calculators are built to withstand regular use, featuring a sturdy exterior. Additionally, Sharp provides a protective cover that helps prevent damage during transport, making these calculators a long-term investment for users.

In summary, both the Sharp EL-5250 and EL-5230 deliver exceptional performance with their extensive features and advanced technology. They are perfect for those who require reliable and efficient tools for various mathematical tasks, whether in education or professional settings. With their user-friendly designs and durability, these calculators continue to be reliable companions for anyone working with numbers.
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